Lines Matching defs:atan
30 #pragma weak __atan = atan
34 * atan(x)
43 * (2). Reduce x to positive by atan(x) = -atan(-x).
45 * (2.1) if x < 2^(-prec/2), atan(x) = x with inexact flag raised
46 * (2.2) if x < 2^(-prec/4-1), atan(x) = x+(x/3)(x*x)
47 * (2.3) if x < 2^(-prec/6-2), atan(x) = x+(z-5/3)(z*x/5)
49 * atan(x) = poly1(x) = x + A * B,
55 * |(atan(x)-poly1(x))/x| <= 2^-57.61
57 * (3.1) if x >= 2^prec, atan(x) = atan(inf) - pio2lo
58 * (3.2) if x >= 2^(prec/3), atan(x) = atan(inf) - 1/x
59 * (3.3) if x <= 65, atan(x) = atan(inf) - poly1(1/x)
60 * (3.4) otherwise atan(x) = atan(inf) - poly2(1/x)
65 * |atan(x)-poly2(x)|<= 2^-59.45
69 * atan(x) = atan(y) + atan((x-y)/(1+x*y)).
72 * atan(x) = atan(y[j]) + poly2((x-y[j])/(1+x*y[j]))
74 * bits and at the same time atan(y[j]) is very close to an IEEE double
126 atan(double x) {